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Born in London, Demontagnac started his playing career with Charlton Athletic, before moving to join the Walsall youth system. Demontagnac created an instant impression on the Walsall coaching staff with his fast pace and footballing talents, especially in getting past defenders.[2]

The 17-year-old Demontagnac marked his October 2005 first team debut with an assist and a goal in a 3–2 defeat away to Port Vale.[3] He went on to make 27 appearances that season, scoring twice, and picked up the club's Young Player of the Year award,[2][4] but was twice sent off for violent conduct.[5]

Walsall manager Paul Merson was replaced by Richard Money in 2006–07. Money selected Demontagnac for the starting line-up just once in the season, choosing to use him as an impact player from the substitutes' bench.[6] Demontagnac signed a two-year contract extension at the beginning of the 2007–08 season,[7] but again spent most of the season as a substitute. His goal against Brighton and Hove Albion in November 2007 was voted the club's Goal of the Season.[2]

In the first round FA Cup tie against Scunthorpe United, he was sent off for an off-the-ball incident only eight minutes after coming on as a substitute.[9] The following day he was arrested on suspicion of a breach of the peace,[5] and on 13 November 2008 his contract with Walsall was terminated. A club statement said that the player's dismissal was the result of "a series of serious breaches of club discipline".[10] Mullen expressed regret over the situation, saying that Demontagnac had the talent to be a Premier League player but his poor conduct held him back.[5]

Following Demontagnac's dismissal by Walsall, Crystal Palace took him on trial.[11] The trial was unsuccessful, but Palace manager Neil Warnock allowed Demontagnac to train and play with the reserve team in the meanwhile.[12]

Demontagnac scored on his full debut on 26 August, in the Seasiders' 4–1 victory over Premier League side Wigan Athletic in the second round of the 2009–10 League Cup.[19] However, he suffered a hamstring strain early in the second half and the following day it was revealed that he might be out of action for a few weeks.[20] He made his return to action in a 4–3 Central LeagueDivision One West reserve team win over Preston North End on 14 October. However, he was sent off for violent conduct in the second half and so received a three match first team ban which, as it was in a reserve team fixture, began 14 days later.[21] Three days later he made his return to first team action as an 86th minute substitute in the 2–0 win over Plymouth Argyle at Bloomfield Road. His first league start came in a 3–0 win at home to Sheffield United on 20 October.

On 8 February 2010, Demontagnac was one of three players, along with Barry Bannan and Neal Eardley, disciplined by Ian Holloway, when they were seen out at a nightclub two days previously in Blackpool following the home defeat to Leicester City, even though Demontagnac was due to train with the squad the following day. Holloway explained: "I'm disappointed – we'll have a party once we've got 52 points. If they think that's appropriate, then they're messing with the wrong man. I like a dance with anybody but it's got to be the right time and when you're in a good mood. I'm not in a good mood when I lose and neither should they be." All three were dropped from the squad for the next game, away to Sheffield Wednesday.[22]

On 7 January 2011, he joined Stockport County on loan for a month[24] and was given the number 11 shirt.[25] He scored on his club debut on 8 January in a 5–1 home defeat to Gillingham.[26] He returned to Blackpool on 8 February at the end of his loan.[27]

On 27 May 2011, Demontagnac signed a one-year contract with Notts County with an option of an extension.[28] On 6 August 2011, Demontagnac made his debut coming on as a substitute in a 3–0 win over Carlisle United. He was sent off on 27 December in a 2–1 defeat against Sheffield United at Bramall Lane for throwing the ball in the face of Matthew Lowton.

By the end of the season in May 2012, he was released by the club, along with 12 other players.[29]

After his released by Notts County, Demontagnac signed a two-year contract with Northampton Town and joined them on 1 July 2012.[30] He was sent off on 3 September 2013 in a 2–0 defeat against Milton Keynes Dons at Stadium mk for a foul on Dele Alli. On 31 January 2014, Demontagnac had his contract terminated.[31]